code: def test_output(self):
      name = self.op_name
      if hasattr(self, "condition"):
          name += "_" + self.condition
      skip_out_check = getattr(self, "skip_check_ver", None)
      if skip_out_check is not None:
          skip_out_check = self.target_opsets
      self.expect(
          self.model,
          self.x,
          name=name,
          skip_outvalue_version=skip_out_check,
          expected_num_initializers=0,
      )
  
file_path: chainer/tests/onnx_chainer_tests/functions_tests/test_poolings.py
imports: import chainer
  import chainer.functions
  from chainer import testing
  import numpy
  from onnx_chainer.testing import input_generator
  from onnx_chainer_tests.helper import ONNXModelTest
label_desc: Use image node_id 2 for calling the TestPoolings obj's underlying member method code with example usage: obj.test_output() without return types